Improvement in vises



UNITED STATES PATENT OFFICE@ ARIEZER JAMESON, 0E TRENTON, NEW JERSEY.

IMPROVEM ENT IN VI'SES.

Specification forming part of Letters Patent No. 56,057, dated July 3, 1,866.

To all whom it may concern:

Be it known that I, ABIEZER JAMESomof rlrenton, New Jersey, have invented an Improvement in Vises, and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention consists of certain concave washers, in combination with convex collars, on the usual socket and screw of an ordinary vise, the whole being constructed and arranged, as fully described hereinafter, so that the jaws of the vise may be adjusted to any desired position without bending the screw or socket or straining any of their parts.

In order to enable others skilled in the art to make and use my invention, I will now proceedto describe its tion.

On reference to the accompanying drawings, which form a part of this specification, Figure lis a sectional view of a vise with my improvement, and Fig. 2 an exterior View.

A is the stationary and B the movable jaw of the vise, the latter jaw being hinged by a pin, a, as usual, and the stationary jaw being secured to the bench by a projection, D, in the ordinary manner. The jaws are otherwise constructed in a manner similar' to those of vises'in common use.

E is a screw passing through an opening, c, in the movable jaw B, and having threads adapted to internal threads in the socket F, which passes through an opening in the stationary jaw A, and which is prevented, as usual, from turning round by a feather or projection, e', the latter, however, being such as not to prevent a free vertical vibration of the socketin the opening of the stationary jaw.

On the socketE is a collar, f, against which lits the plane rear of a washer, G, the front of which is convex and adapted to the concave rear of another washer, H, the plane front of which bears against the rear of the stationary jaw A.

The screw F terminates in front in the usual spherical or other suitably-formed enlargement t', through which passes the ordinary vise-han'- die I, and at the rear of this enlargement is a collar, j, having a convex face adapted to the concave front of a washer, K, the plane rear of .which fits against the front face of the movable jaw B ofthe vise.

In vises of the ordinary construction a collar on the socket F bears directly against the construction and opera-T rear of the stationary jaw A and a collar on the screw directly againstthe front of the movable jaw B; or plane washers are sometimes introduced between the collar on the screw and the movable jaw.

Those familiar with the construction and use of ordinary vises are aware that the bearfriction and strain and an unequal wear and tear of the bearing parts must of necessity ensue, so that the screw is frequently bent or stripped, while the socket is often split or broken.

It will be evident that this defect is obviated by my invention, the bearing-surfaces of the washer G and collar j accommodating themselves to the different positions assumed by the jaws, the washers H K sliding upward on the `faces of the jaws as` the latter are opened, so that the screw and socket never assume such an angle to the jaws as to occasion undue friction or Strain any of the parts.

As the washers G H are detachable, they may be readily applied to vises of the ordi-l nary construction without altering the latter'.`

A detachable washer may also be used in place of the collar j, and may be applied, with the washer K, to ordinary vises in the Same manner as the washers G H.

I claim as my invention and desire to secure by Letters Patentl. The screw E, with :its convex collar or washerj, adapted to the concave sliding washer K, substantially as and for the purpose described.

2. The combination of the above with the washers G and H, intervening between the collar f of the socket F and the fixed jaw A of the vise.

In testimony whereof I` have signed my name to this specification in the presence of two subscribing witnesses.

ABIEZER JAMESON.

Witnesses:

CHARLES B. PRICE, CHARLES E. FOSTER. 

